LM4666, LM4666SDBD

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SNAS189A – MAY 2004 – REVISED MAY 2013

LM4666

Filterless High Efficiency Stereo 1.2W Switching

Audio Amplifier

Check for Samples: LM4666, LM4666SDBD

1

FEATURES

DESCRIPTION

The LM4666 is a fully integrated single-supply high

2

•

No Output Filter Required for Inductive

efficiency switching audio amplifier. It features an

Transducers

innovative modulator that eliminates the LC output

•

Selectable Gain of 6dB or 12dB

filter

used

with

typical

switching

amplifiers.

•

Very Fast Turn On Time: 6ms (typ)

Eliminating the output filter reduces parts count,

simplifies circuit design, and reduces board area. The

•

Minimum External Components

LM4666 processes analog inputs with a delta-sigma

•

"Click and Pop" Suppression Circuitry

modulation technique that lowers output noise and

•

Micro-Power Shutdown Mode

THD when compared to conventional pulse width

modulators.

•

Short Circuit Protection

•

Available in Space-Saving NHK0014A Package

The LM4666 is designed to meet the demands of

mobile phones and other portable communication

devices. Operating on a single 3V supply, it is

APPLICATIONS

capable

of

driving

8

Ω

transducer

loads

at

a

•

Mobile Phones

continuous average output of 450mW with less than

•

PDAs

1%THD+N. Its flexible power supply requirements

allow operation from 2.8V to 5.5V.

•

Portable Electronic Devices

The

LM4666

has

high

efficiency

with

an

8

Ω

KEY SPECIFICATIONS

transducer load compared to a typical Class AB

amplifier. With a 3V supply, the IC's efficiency for a

•

Efficiency at 3V, 100mW into 8

Ω Transducer:

100mW power level is 79%, reaching 84% at 450mW

79% (typ)

output power.

•

Efficiency at 3V, 450mW into 8

Ω Transducer:

The LM4666 features a low-power consumption

84% (typ)

shutdown mode. Shutdown may be enabled by

•

Efficiency at 5V, 1W into 8

Ω Transducer: 85%

driving the Shutdown pin to a logic low (GND).

(typ)

The LM4666 has fixed selectable gain of either 6dB

•

Total Quiescent Power Supply Current: 7.0mA

or 12dB. The LM4666 has short circuit protection

(typ)

•

Total Shutdown Power Supply Current: 0.02µA

(typ)

•

Single supply range: 2.8V to 5.5V

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.